58 research outputs found
GEOCHEMICAL INVESTIGATIONS OF ENVIRONMENTAL POLLUTION IN A DARASUN GOLD MINE TAILINGS AREA (TRANSBAIKAL KRAY, RUSSIA)
No full textA GEOPHYSICAL AND GEOCHEMICAL STUDY OF THE SHAHTAMA MOLYBDENUM MINE TAILINGS DEPOSIT (TRANSBAIKAL AREA, RUSSIA)
No full textABANDONED MINE WASTES (KEMEROVO REGION, RUSSIA): RESOURCES OF TOXIC AND VALUABLE COMPONENTS
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INTEGRATION OF ELECTRICAL PROSPECTING METHODS AND GEOCHEMICAL TESTING FOR THE CONSTRUCTION OF TAILING DUMPS MODELS
No full textDiagonal Representation of Algebraic Power Series: A Glimpse Behind the Scenes
Get PDFThis work is based on the author’s master’s thesis (U. of Vienna, 2020), supervised by H. Hauser.International audienceThere are many viewpoints on algebraic power series, ranging from the abstract ring-theoretic notion of Henselization to the very explicit perspective as diagonals of certain rational functions. To be more explicit on the latter, Denef and Lipshitz proved in 1987 that any algebraic power series in n variables can be written as a diagonal of a rational power series in one variable more. Their proof uses a lot of involved theory and machinery which remains hidden to the reader in the original article. In the present work we shall take a glimpse on these tools by motivating while defining them and reproving most of their interesting parts. Moreover, in the last section we provide a new significant improvement on the Artin-Mazur lemma, proving the existence of a 2-dimensional code of algebraic power series
Permafrost Degradation Impact on Water Bodies in the Siberian Tundra (Samoylov and Kurungnakh Islands, Lena Delta) Using GIS Analysis of Remote Sensing Data and a Geochemical Approach
No full textThe article presents the geomorphological and geochemical investigation of the water bodies on the Samoylov and Kurunghnakh Islands, the Lena River delta. We used GIS-analyze analysis for identifying water body groups, depending on their geomorphological features. The studied water bodies are located on two principally different surfaces: the first and the third terraces of the Lena Delta. The water bodies occupy thermokarst hollow bottoms, which have various elevations above sea level. We identified the altitudes of the water bodies’ water surfaces by analysing with ArcticDEM. Additionally, we estimated the area of the water bodies by hand after mapping the borders of the water bodies in UAV imageries. We sampled the bottom sediments and water’s chemical composition. All water bodies were divided into groups: (1) small water bodies on the Yedoma upland surface; (2) water bodies in six thermokarst hollows; (3) water bodies on the first terrace. The water bodies bottom sediments on the Yedoma are depleted by the As and enriched by the Zn and Mo in comparison with sediments of other groups. The Rare Earth Elements concentrations in the bottom sediments of Yedoma water bodies and several water bodies on poorly degraded surfaces of the third terrace are lower than in other water bodies, except La
The art of algorithmic guessing in gfun
Get PDFInternational audienceThe technique of guessing can be very fruitful when dealing with sequences which arise in practice. This holds true especially when guessing is performed algorithmically and efficiently. One highly useful tool for this purpose is the package named gfun in the software Maple. In this text we explore and explain some of gfun's possibilities and illustrate them on two examples from recent mathematical research by the author and his collaborators
Early Taoist concept of Dao (way) and approaches of Russian sinologists to the interpretations of Dao de jing
No full textThe author compares the interpretations, which the leading Russian sinologists worked out for the concept of Dao (Way) in taoist treatise Dao de jing , shows how these interpretations are determined with the points of view on the text designation, philosophical world outlooks and methodological approaches as well, clears up similarities and distinctions between the approaches and the main trends of their evolution
Soviet Advisors Group in South China and Soviet Union Financing of Gomindan War Planes in 1924
No full textThe article dwells on the organization and activities of the Soviet advisors group, which assisted to the South China government of Sun Yatsen, its participation in financing Kuomintang political and military projects. The author pointed out that the main aim of the advisors group efforts was to form new Kuomintang power institutions and to bring its policy and army under control, for all that the tactics of implementation of strategy aim were constantly changing
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